Canon Speedlite 580EX II. This flash gun features, E-TTL II evaluative flash metering for critically accurate exposure, high output with maximum guide number 58 at 105mm setting (ISO 100, metres), autozoom and colour temperature information for improved flash with selected digital SLR cameras, fully featured wireless flash capability, with built-in slave and transmitter, using multiple Speedlites. It is also dust and water resistance which improves reliability under harsh conditions. This flash gun is in very good condition, with a few very light marks on plastic. It comes with original case and full instructions.